Introduction: Why Choosing the Right Joists Matters
With the increasing emphasis on outdoor living spaces, more and more homeowners are choosing to build or replace their terraces with composite materials. The composite terrace is composed of wood and plastic. Its service life is longer than traditional wood. This is because it is less prone to decay, cracking, and insect infestation. Choosing appropriate support beams is crucial for long-term durability and stability when constructing composite panel structures. As a foundation support, the joists ensure that your deck remains sturdy and will not warp or damage over time. In this article, we will explore the optimal support beams for composite flooring, including material selection, spacing recommendations, and installation techniques.
What Are Composite Decking Joists?
Composite decking joists are the structural beams that support the decking boards. They provide the necessary framework to distribute weight evenly and prevent sagging. Unlike traditional wood decking, composite decking requires a specific type of joist to ensure proper performance and longevity.
Best Joist Materials for Composite Decking: Pros & Cons
Aluminum Joists
Highly durable and resistant to corrosion
Ideal for wet or humid climates
Lightweight yet strong
Longer lifespan compared to other materials
Steel Joists
Excellent load-bearing capacity
Fire-resistant and termite-proof
Best for high-traffic or commercial decking projects
Requires professional installation due to weight and cutting difficulty
Composite Joists
Made from recycled plastic and wood fibers
Designed to work perfectly with composite decking
Resistant to rot, moisture, and insect damage
Eco-friendly and long-lasting
Pressure-Treated Timber Joists
Budget-friendly option
Easy to cut and install
Requires proper sealing and maintenance to prevent decay
May warp or shrink over time
How to Space Composite Decking Joists Correctly? (Joist Spacing Guide)
Frame height above ground
The height of the deck frame above the ground directly affects its moisture resistance and corrosion resistance. A higher frame can reduce the risk of ground moisture eroding the support beams, especially in rainy or damp areas. It is recommended to use composite beams and ensure sufficient ventilation space between the frame and the ground. The height of the support beam above the ground can be supported by a plastic base or a cement base.
Distance between supporting beams
The distance between the centers of two beams is called their “spacing”, usually measured in inches. The standard distance between the support beams on the family deck is 16 inches, and due to the low load-bearing capacity, the spacing can be appropriately widened. And in business places with high foot traffic, the distance between decks should be slightly denser by 12 inches. The closer space between the support beams makes the deck stronger and more stable, but the material cost is also higher. The appropriate spacing should be selected based on the usage of the deck and the building regulations in your area.
Thickness and width of the support beam
The thickness of the support beam directly affects the bearing capacity and stability of the bridge deck. The width of the support beam directly affects the contact surface between the floor and the support beam. A support beam with a larger cross-section provides greater support, but also increases material costs. It is recommended to choose the appropriate thickness of the support beam based on the size, span, and purpose of the bridge deck, usually 2×6 inches or 2×8 inches.
Conclusion Choosing the Right Joists for Your Composite Decking
Choosing the appropriate composite deck beam is crucial for a sturdy and durable deck. Aluminum and steel joists have excellent durability, while composite materials and treated wooden joists provide an economically efficient option. By selecting the best beam materials and ensuring appropriate spacing, you can enjoy beautiful and stable composite decks in the coming years.
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